Ph Neutralization Investigation

In this lab, the purpose was to determine the stability of a substance after adding an acid or a base. The results claim that liver and buffer are the most resistance to change in pH. Looking at figure 3, buffer and liver both maintain a stable pH even with the addition of an acid or base. However, potato and water have less buffer in them since their pHs did change. In figure 3, the potato acid’s pH level decreased by two, and the potato base’s pH level increased by two. The level of pH of a water acid decreased by 4, while the water base’s pH increased by 5. These results all tie to the fact that buffer is a substance that maintains a stable pH; the presence of buffer in organisms help maintain homeostasis by binding or releasing hydrogen

The more acidic a substance is the less oxygen it will produce when going through a chemical reaction. During the Lab “How Do Changes in pH Levels Affect Enzymes Activity”, the researcher conducted an experiment to test the effects that an acidic, neutral, and a base substance will have when combine it with hydrogen peroxide. The data table shows that HCL (acidic substance) barley produced any oxygen at all when it was combining with Hydrogen Peroxide. The pH level for HCL was 2.5; this level indicates that the substance was very acidic. When the H2O and NaOH were tested they produced more bubbles than HCL. NaoH produced a little more bubbles than HCL. The pH that NaoH produced was a 9, which is a base. H2O produced more bubbles than both substances;

1. Record your hypothesis about what will happen when Biuret solution is mixed with the solutions from test tubes 1, 2, 3, and 4 here. Be sure to use scientific reasoning to support your hypothesis.

When the tip of the rod touched the pH paper, the color of the pH paper became blue.

Purpose/Hypothesis: The purpose of this experiment is to use both cabbage juice and pH paper to determine the pH of household items. This way, we can tell which products are basic and which one are acidic. If we use cabbage juice as an universal pH indicator by comparing it to pH paper then pH determined by the cabbage juice will be unstable because by using cabbage juice, it can be different depending on how diluted it is.

In the last test, we had to test out a mystery powder (powder A, B, C), in its own separate test tube, in order to solve the Sherlock Holmes Mystery. Our group had powder C. When we mixed water in the mystery powder, it did not dissolve. When the litmus paper was put into the test tube it turned blue. When the vinegar was mixed it bubbled/foamed up. When we mixed the iodine solution, there was no reaction and the solution turned to a dark brown/black color. When we mixed in the baking soda there was no reaction and it turned to an even darker color.

Solub. Or Reaction w/ hot H20: no change observed from the cool water and is soluble

To conclude, the data we have collected from both experiments suggests that Le Chatelier’s principles are applicable and correct. When different substances were added to different solutions, the equilibrium shifted appropriately in order to gain a balance. The shifting of equilibrium resulted in different color changes in different mixtures. In part 2 of the experiment we the aforementioned changes were more easily spotted. We saw the relationship between forward and reverse reactions. When NaOH was added to tube #8 we saw that the color changed from orange into yellow, in order to gain balance but when we added HCl back, the color again changed to orange. Which clearly proved Le Chatelier’s

The moment an Alka-Seltzer tablet hits water, it begins to fizz. These tablets are over-the-counter antacids and pain relief medications that contain aspirin, sodium bicarbonate, and citric acid. The fizzing is a result of a reaction occurring where carbon dioxide (in the form of bubbles), water, and sodium acetate is formed. The fizzing and carbon dioxide bubbles are a result of the sodium bicarbonate splitting and reacting with the citric acid. In this experiment we are determining the percent by mass of sodium bicarbonate (NaHCO3) in Alka-Seltzer tablets and exploring the relationship between amounts of reactants and products.

The objective of the Irresistible lab is to determine the capacity of each solution (unbuffered and buffered both) and how much they resist changes to pH. This is accomplished by having ten graduated beakers: two containing pure water, two with .1 M

weak bases). After ranking the pH of these solutions, you will then test your predictions in the laboratory.

Problem & error: Write a paragraph about the issues you had in performing this lab. What went well, what did not go so well? What could you have done to improve your performance on the lab?

Finally students measured twenty five milliliters of a basic solution into the third beaker, labeled beaker C, and once again tested for the pH of the solution with a pH test strip. The class then repeated the same process as aforementioned with the third solution, the class dropped

Chem II Background Info The neutralization of hydrochloric acid with sodium hydroxide solution is represented by the following equation. HCl(aq) + NaOH(aq) → NaCl(aq) + H₂O(l) Using a calorimeter, you will determine the enthalpy change for this reaction. Question

A color code was used to tell what the pH of the water was. For example, if the pH was 6, the pH test paper would turn into the color yellow, and if the pH was 7, the pH test paper would be a light green. Identifying the pH based on color could have slight human error as the pH could actually be 6.8, but when the pH of the water was tested, it could have been seen as a light green instead of a darker yellow green, thus the pH would be identified as 7 instead of the proper 6.8. Another issue that could’ve been caused from human error was that when measuring the amount of water by using a graduated cylinder, it could’ve been measured a slight bit off. Originally, the amount of water that was used for testing was 25mL. However, when measuring the amount of water, the water could’ve been 24.9 mL instead of 25mL due to the miniscus being formed and where the meniscus was believed to be. This would cause the amount of water being tested not the same for all the types of waters. Another issue that could’ve affected the result was that the refrigerator that held the test tubes that were in the cooler environment was frequently